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High-sensitivity negative-ion laser spray for liquid chromatography/mass spectrometry
K Hiraoka1, Y Asakawa, Y Yamamoto
1Clean Energy Research Center, Yamanashi University, Takeda-4, Kofu 400-8511, Japan. hiraoka@ab11.yamanashi.ac.jp
Rapid Communications in Mass Spectrometry : RCM
|October 25, 2001
Summary
A novel laser spray interface for liquid chromatography/mass spectrometry (LC/MS) significantly enhances sensitivity for detecting various compounds. This method also shows potential for direct structural analysis of thermally labile molecules.
Area of Science:
- Analytical Chemistry
- Spectrometry
Background:
- Liquid chromatography/mass spectrometry (LC/MS) is a powerful analytical technique.
- Existing interfaces like electrospray have limitations in sensitivity and applicability for certain compounds.
Purpose of the Study:
- To develop and evaluate a new negative-ion mode laser spray interface for LC/MS.
- To compare the sensitivity and capabilities of laser spray with traditional electrospray.
Main Methods:
- Development of a negative-ion mode laser spray interface.
- Investigation of its performance in LC/MS analysis.
- Comparison of sensitivities with negative-ion electrospray for various samples.
Main Results:
- The laser spray interface demonstrated significantly higher sensitivity (orders of magnitude) compared to negative-ion electrospray for most tested samples, excluding sugars.
- Formation of fragment ions (HSO(-4) and SO(-3)) was observed from cholesterol 3-sulfate sodium salt using laser spray.
- These fragment ions suggest potential for direct structural elucidation of thermally labile compounds.
Conclusions:
- The developed laser spray interface offers superior sensitivity for LC/MS analysis.
- It provides a promising avenue for obtaining structural information directly from mass spectra, particularly for thermally sensitive molecules.